Comparison

Centering50 vs DropNotify

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Centering50

This tool helps collectors accurately measure card centering ratios for TCG and sports cards. It uses AI-assisted scanning and manual guides to provide precise measurements, helping users predict grades and save on submission fees.

Highlights
  • AI-assisted border detection
  • Manual measurement guides
  • Front and back analysis
  • 15x precision zoom
  • Grading standard library
  • Dynamic contrast adjustment
Features
Read full description

Centering50: TCG & Sports Card Grading Tool Stop guessing and start grading with confidence. Whether you are a hardcore Pokémon TCG investor, a sports card flipper, or a casual collector, centering is the #1 reason cards fail to hit a Gem Mint 10. Centering50 is the professional-grade scanner designed to help you predict your grade before you spend a cent on submission fees. WHY CENTERING MATTERS In the modern hobby, the price gap between a PSA 9 and a PSA 10 can be thousands of dollars. Professional graders at PSA, BGS, SGC, CGC, and TAG use digital precision to measure border ratios. If your card is even 2% off, you lose the Gem Mint dream. Centering50 brings that same laboratory precision to your smartphone. PRECISION FEATURES FOR COLLECTORS: "Smart-Snap AI: Our algorithm helps you detect card borders for lightning-fast scanning of modern Pokémon, Magic: The Gathering (MTG), Lorcana, and One Piece cards. Save time with AI-assisted alignment, then fine-tune for 0.1% precision." Auto-Straighten Technology: Don't worry about perfect alignment. Scan at any angle and the app will instantly fix the tilt. The "Magenta Line" Manual Mode: For vintage cards or thick-bordered sports cards (Topps, Panini, Upper Deck), use our high-contrast measurement guides to set your own anchor points with 0.1% accuracy. Grading Standard Library: Instantly compare your results against the official 2026 standards: PSA: 55/45 Front (New 2025 Standard) BGS: 50/50 for Black Label eligibility SGC & CGC: Real-time centering thresholds Front & Back Analysis: Don't get rejected for a 90/10 back! Measure both sides independently to ensure your submission is truly "Perfect." 15x Precision Zoom: Perfectly align your guides on thin silver or gold borders with our enhanced magnification tool. SAVE MONEY ON SUBMISSION FEES Sending cards to be graded is expensive. Why pay for a "Near Mint 7" when you could have known the result at home? Use Centering50 to filter your collection and only send your strongest candidates. It’s the ultimate pre-grading utility for: Pokémon TCG (English & Japanese) Sports Cards (Basketball, Baseball, Football, Soccer) Disney Lorcana & One Piece TCG Yu-Gi-Oh! & Magic: The Gathering DESIGNED FOR THE 2026 HOBBYIST We know you’re scanning in different lighting. Our app features Dynamic Contrast Adjustment and Skew Correction, so even if your photo is slightly tilted, our math remains perfect. HOW TO USE: Place your card on a high-contrast, flat surface (no sleeves for best results). Take a photo directly from above. (with the green bubble in center) Align the Centering50 guides with the card edges and the internal art border. (Optionally: Unlock the image and move/resize/rotate) Get your LR (Left/Right) and TB (Top/Bottom) ratios instantly. JOIN THE 50/50 CLUB Centering50 isn't just a calculator; it’s your secret weapon in the grading game. Download now and take the guesswork out of your collection. Note: Centering50 provides a highly accurate estimate based on physical centering. Final grades are determined by professional grading companies based on additional factors like surface, corners, and edges. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

DropNotify

Get instant notifications when popular retailers restock desired items. Track product availability online and in-store for collectibles, deals, and more. Offers both free and premium subscription tiers for enhanced features.

Highlights
  • Real-time push notifications
  • Online and in-store restock tracking
  • Support for major retailers
  • Track collectibles and deals
  • Free and premium subscription options
  • Local restock maps
Features
Read full description

DropNotify is the fastest way to know when products restock — online and in-store. Get real-time push notifications the second a drop goes live at Walmart, Target, Costco, Pokemon Center, Best Buy, Amazon, Sam's Club, GameStop, and more. Whether you're collecting Pokemon cards, hunting retail drops, or flipping deals — DropNotify keeps you ahead of the pack. Free Access Restocks From Target/Walmart/Amazon/Pokemon Center - Subscribe up to 50 SKUs - View what other users are following - View what is restocking now - View how often items are restocking Paid Access With Trainer+ ($9.99/m) All Features above including - Faster restock pings and more SKUs to subscribe to - Subscribe to unlimited SKUs - View local restock maps seeing whats restocking from Bestbuy and Dollar General - Get alerts when Target/Walmart/Costco/Pokemon Center are restocking live! DropNotify is built by collectors, for collectors. We don't sell your data — we just make sure you never miss a drop. - Links in our app may be affiliated. This is needed to ensure we can continue to offer free services. - Privacy Policy: https://dropnotify.app/privacy-policy - Terms of Use (EULA): https://dropnotify.app/terms-of-service Trainer+ Membership is a $9.99 USD/month auto-renewable subscription. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage in your Apple ID settings.

Screenshots

Centering503 screens
DropNotify4 screens

Verdict

The call

Centering50 and DropNotify both sit at 4.4 stars, but that hides the real split: 63% of DropNotify's written reviews are positive against 0% of Centering50's. DropNotify also leads on ads (none vs shown). On price, rating, ratings volume and update cadence there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Centering50 sells 3 in-app purchases, starting at $4.99 per month and DropNotify sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Centering50 against 4.4 for DropNotify. Both are backed by a comparable volume of ratings — 28 and 16 respectively. Written reviews are what separate them: 0% of Centering50's written reviews are positive against 63% of DropNotify's.

UpkeepUpdate frequency

Centering50 ships an update every 8 days, DropNotify every 2 weeks. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

Scorecard2 real differences · 8 level
Centering50 versus DropNotify: the parameters behind the verdict, then further details
ParameterCentering50DropNotify
PriceFreeFree
Rating4.4 (28 ratings)4.4 (16 ratings)
Positive reviews0.0% of reviews62.5% of reviews — better
Number of ratings28 — better16
Update frequencyEvery 8 days — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhoneiPhone, iPad — better
Requires iOS16.216.0 — better
Further details — not scored
Size155 MB8 MB
Age rating17+4+
DeveloperFUK WAI LIBrendan Forti

Customer experience

Centering50

All ratings28 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

DropNotify

All ratings16 ratings
Positive81.3%
Neutral6.3%
Negative12.5%
Written reviews8 reviews
Positive62.5%
Neutral12.5%
Negative25.0%

In-app purchases

3 purchases

Centering50

Subscriptions2
  • Unlimited Monthly$4.991 Month
  • Unlimited Yearly$24.991 Year
One-time1
  • Full Version Lifetime Access$49.99
1 purchases

DropNotify

Subscriptions1
  • DropNotify Premium$9.991 Month

Questions

Is Centering50 free?
Centering50 is free to download, with in-app purchases available.
Is DropNotify free?
DropNotify is free to download, with in-app purchases available.
Which has better reviews, Centering50 or DropNotify?
Centering50 and DropNotify are both rated 4.4 out of 5 on the App Store, from 28 and 16 ratings respectively.
Do Centering50 or DropNotify have ads?
Centering50 shows ads; DropNotify does not.
Which is updated more often, Centering50 or DropNotify?
Centering50 ships an update every 8 days, and DropNotify every 2 weeks. Most recently, Centering50 was updated on October 6, 2026 and DropNotify on October 9, 2026.

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